I can kind of agree on Catastrophe raids, as the majority of them see stun at least twice.
I would not agree with raid events. They're usually normal->raging->stun->normal, possibly a bit of raging round 2 if shavers were used in raging #1. Otherwise, by the time you hit stun, you've already gone through the bulk of the threat the fight poses.
Unless you're arguing less for materially affecting odds of victory and more for something else, like using a stun punisher to yank away MVP. Then there's enough remaining HP for that to be possible in some cases.